[wasm] Fix I32ReinterpretF32 and I64ReinterpretF64 on ia32.

test/cctest/wasm/test-run-wasm.cc

Index: test/cctest/wasm/test-run-wasm.cc
diff --git a/test/cctest/wasm/test-run-wasm.cc b/test/cctest/wasm/test-run-wasm.cc
index a5f7ddec2b7833e12659842f6add1e06a4372d7c..5cc6b5a42514629c6d867d09b3575e625fe379a4 100644
--- a/test/cctest/wasm/test-run-wasm.cc
+++ b/test/cctest/wasm/test-run-wasm.cc
@@ -1048,6 +1048,16 @@ WASM_EXEC_TEST(I32ReinterpretF32) {
   }
 }
 
+WASM_EXEC_TEST(SignallingNanSurvivesI32ReinterpretF32) {
+  WasmRunner<int32_t> r(execution_mode);
+
+  BUILD(r, WASM_I32_REINTERPRET_F32(
+               WASM_SEQ(kExprF32Const, 0x00, 0x00, 0xa0, 0x7f)));
+
+  // This is a signalling nan.
+  CHECK_EQ(0x7fa00000, r.Call());
+}
+
 WASM_EXEC_TEST_WITH_TRAP(LoadMaxUint32Offset) {
   WasmRunner<int32_t> r(execution_mode);
   r.module().AddMemoryElems<int32_t>(8);